发表机构
National Institute for Materials Science; Institute of Science Tokyo; Christian-Albrechts-Universität; Nara Women’s University; Kyoto University; Kwansei Gakuin University（物质材料研究机构; 东京科学大学; 基尔大学; 奈良女子大学; 京都大学; 关西学院大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究通过自组装制备双原子 Kagome 晶格，结合 STM 观测与紧束缚计算直接证实其存在对应石墨烯的拓扑边缘态，为探索特殊晶格几何的量子材料提供了理想超分子平台。
AI 中文摘要
晶格几何对晶体中 Bloch 电子的行为起着基础性作用。双原子 Kagome 晶格是蜂窝晶格与 Kagome 晶格的延伸，理论预测其会产生新奇的拓扑现象，但至今实验研究有限。本文通过具有吩嗪（phenazine）基团的三蝶烯衍生物（Trip-Phz）的自组装制备了双原子 Kagome 晶格，该分子为具有 C₃ 对称性的非平面 π 共轭分子。扫描隧道显微镜（STM）观测显示，Trip-Phz 在 Pb(111) 表面形成了以锯齿型边缘终止的高度有序双原子 Kagome 晶格。结合 STM 测量与紧束缚计算，提供了对应于石墨烯边缘态存在的直接证据，这些态是由 Zak 相位量子化及体边对应关系决定的拓扑边缘态。本工作揭示了一个利用超分子技术探索具有独特晶格几何的量子材料的理想平台。
英文摘要
Lattice geometry plays a fundamental role in the behavior of Bloch electrons in a crystal. The diatomic Kagome lattice, an extension of the honeycomb and Kagome lattices, is predicted to give rise to emergent and topological phenomena, but its experimental investigation has been limited thus far. Here, we fabricate a diatomic Kagome lattice through self-assembly of a triptycene derivative with phenazine moieties (Trip-Phz)---a $\mathrm{C_3}$-symmetric, non-planar $π$-conjugated molecule. Our scanning tunneling microscopy (STM) observations show that Trip-Phz forms a highly ordered diatomic Kagome lattice terminated by zigzag-type edges on the Pb(111) surface. Combined STM measurements and tight-binding calculations provide direct evidence for the existence of the edge states that correspond to those of graphene. These states are topological edge states dictated by the quantization of the Zak phase and the bulk-edge correspondence.This work reveals an ideal platform for exploring quantum materials with unique lattice geometries using supramolecular technology.
Comments22 pages, 4 figures, published online in Nano Lett., https://pubs.acs.org/doi/10.1021/acs.nanolett.6c03195
DOI：10.1021/acs.nanolett.6c03195
